Method of balancing assembly of wheel and tire

A method of balancing an assembly of a wheel and a tire, the method comprising:

• measuring each of an internal runout and an external runout of the wheel;
• extracting an internal runout waveform, expressed as a continuous function, from data resulting from measuring the internal runout of the wheel;
• extracting an external runout waveform, expressed as a continuous function, from data resulting from measuring the external runout of the wheel;
• synthesizing the internal runout waveform and the external runout waveform and thus generating a synthesis waveform;
• marking a minimum-value position on the synthesis waveform, as a wheel reference position, on the wheel;
• measuring radial force variation (RFV) of the tire;
• extracting a waveform of the tire, plotted as a continuous function, from data resulting from measuring the RFV of the tire;
• marking a maximum-value position on the waveform of the tire, as a tire reference position, on the tire;
• and
• assembling the wheel and the tire in a state where the wheel reference position on the wheel and the tire reference position on the tire are aligned to have a same phase.

A method of marking a minimum-value position of runout of a wheel, the method comprising:

• measuring each of an internal runout and an external runout of the wheel;
• extracting a primary component of a waveform of the measured internal runout and a primary component of a waveform of the measured external runout and setting the primary component of the waveform of the measured internal runout and the primary component of the waveform of the measured external runout to be an internal runout waveform and an external runout waveform, respectively;
• forming a synthesis waveform by causing the internal runout waveform and the external runout waveform of the wheel to overlap and connecting only profile portions each of which has a value higher than or a same as a predetermined value;
• and
• marking a minimum-value position on the synthesis waveform, as the minimum-value position of the runout of the wheel.